WebSocket: open event

The open event is fired when a connection with a WebSocket is opened.

Syntax

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener('open', event => { })

onopen = event => { }

Event type

A generic Event.

Examples

// Create WebSocket connection.
const socket = new WebSocket('ws://localhost:8080');

// Connection opened
socket.addEventListener('open', (event) => {
  socket.send('Hello Server!');
});

Specifications

Specification
HTML Standard
# event-open
HTML Standard
# handler-websocket-onopen

Browser compatibility

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See also